A composite steel structure roofing floors.

摘要

A composite steel structure for ceilings floors (1), characterized by the combination of the following: or a beam (3) as drawer, steel, is provided as support for the assembly of precast roof (2) steel or prestressed concrete, in particular hollow slabs; or the beam (3) as drawer consists of an upper wing (4), two lateral webs (5) and a lower wing (5) with parts (6a, b, c, d) projecting outside the cross section closed; or the upper wing (4) and the webs (5) have openings (10, 11) for inserting reinforcing elements (15) and / or for the introduction and compaction of concrete; or the height of the beam (3) as the drawer is larger than the thickness of the floor ceiling (1), the upper side of the upper wing (4) of the beam (3) as drawer and the surface being the roof elements (2) located at least approximately in a plane; or the ceiling elements (2) are supported on the projecting parts (6a, b, c, d) of the bottom flange (6) of the beam (3) as drawer; or between the bottom flange (6) of the beam (3) as drawer and the lower edge of the roof elements (2) are provided, in installed condition, spacers (12) or the beam (3) shaped drawer is prestressed by means of tension members (7) disposed in the enclosure inte rior-; or the tension members (7) are driven so that due to the prestressing a bending moment opposite to the development of the bending moments due to external loads address is generated.